Dave, I'll add to my reply to your question in the other thread(by the way, that makes it harder to come up with a coherent response)by pointing out that bigger speakers(including Axioms)quite often are more sensitive than smaller ones and so require less, not more, power.

The 6 1/2" M60 drivers aren't "mid/bass", they're entirely bass. The mid-range is handled by the 5 1/4" driver and matches well with the same driver in the M2.

If the back surround speakers in a 7.1 setup are 16' behind the listening position, they should be separated by about that same distance if it's otherwise convenient.

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Enjoy the music, not the equipment.